Motor



J1 1.9 llilllli Sept. 29, 1931. z LEFFEL 1,825,531

MOTOR Filed July 26, 1929 1a 14 J Q1 Q7 WITNESSES H aZ 2 /f Z all/a7 e 6 BY W Q ATTORNEYS Patented Sept. 29, 1 931 UNITED STATE-s saw an Application iled my 26,1929. I Serial no. salsa This invention relates .to motors.= i It is among the objects of the present invention to provide a novel and improved electrical motor which is simple in construc- 5 tion and operation and well designed to meet the demands of economic manufacture.

A further object of the present invention'is to provide an electrical motor readily controllable to move only a selected fraction of a revolution.

The present motor is especially designed for use in controlling the setting of associated electrical apparatus, such as radio 're ceiving condensers or the like.

It is thus further among the objects of the present invention to provide an electrical motor which upon movement of a controlling switch will move any desired fraction of a revolution and at the expiration of such movement will automatically operate to break the energizing circuit whereby no loss .of current will be possible and whereby the 'motor will automatically stop after a desired fraction of a revolution.

Other objects of the present invention include the combination and interrelation of-- parts whereby the whole forms a novel, simple and improved device which 1s simple 1n construction and operation and well designed for use as .a remotely controllable radio tuning unit.

()ther objects and features of the present invention will be apparent from a consideration of the following specification taken in conjunction with the accompanying drawings, in which j Figure 1 is a diagrammatic illustration showing one preferred application of the present inventlon; I

Fig. 2 is a vertical section through one embodiment of the present invention and illustrating the wiring dia ram therefor;

Fig. 3 is a side elevationofthe motor part- 1 broken away and illustrating by the dotted l1nes22,'the plane'in which the section of Fi .2istaken. eferring more articularly to Fig. 1 of the drawings, it wi 1 be seen that the device is particularly adapted foruse as a remote control apparatus, the receivingan'd control ing room, A',. the cohventional loud speaker the room B. The motor generally indicated room being :indicated by theletter A,'the radioreceivmg apparatus and the motor bemg posltioned in some remote room as indicatednby the letter B. Within the receiv- 58 or other receiving apparatus indicated by the numeral 10, is positioned and electricall connected in any desired manner, not s own, WIth the radio receiving unit 11 positioned in CO by the numeral 12 is associated with the rece1v1ng apparatus 11, to control the apparatus by. connection such as with the condensers thereof, through a shaft 13. For controlling the motor 12, a switch therefor generally indicated as at 14, isprovided, an positioned within the receiving room A and electrically connected in suitable manner, not shown, with the motor 12.

It will readily be understood that the illustration of Fig. 1 shows only one utilization to which the motor may be put, and that the motor of the present invention is not confined to use with a radio receiving apparatus either 'eonnected to the condensers or other controls thereof, but that the motor is particularly adapted forremote control of the radio apparatus through the arrangement herein illustrated.

Referring more particularly to Figs. 2 and 3 of the drawings, it will be seen that the motor includes an external casing 15, which is here illustrated as being circular and includes a suitable supporting base 16. Within the casing 15 and mounted to extend inwardly from the side walls thereof, a plurality of spaced electromagnets 17 are provided, each of which is connected by an associated conductor 18 with an associated contact point 19 of the switch mechanism, as illustrated at 14 in Fig. 1, and diagrammatically illustrated in Fig. 2, as will be hereinafter described.

J ournaled through the sides of the casing 115, a rotor shaft 20 is provided, which. carries within the casing a commutator wheel 21 upon which ride brushes 22 carried by the electromagnets 17. It will be seen that the commutator wheel21 is insulated from the shaft 20 by means of the insulating material 21', the arrangement being such that electriw cal energy supplied from a suitable source of potential, as indicated by the battery 23 passes through the selected contact 19 and associated conductor 18, to one of the electromagnets 17 and therefrom through the brush 22 to the commutator wheel 21.

The commutator wheel 21 is further provided with an insulating insert 25., which is arranged to break the circuit of the energized electromagnet 17 when the desired fraction of a revolution of the shaft 20 has been completed. It will be understood that the commutator wheel 21 is mounted on the shaft 20 for rotation therewith.

Within the housing 15 and carried by the shaft for rotation therewith, there is provided a rotor arm 26, the outer end of which is turned inwardly to support a movable electromagnet 27, which revolves with the shaft 20. The electromagnet 27 carried by the rotor arm 26 is electrically associated in any desired manner, as indicated by the conductor 28, with the commutator wheel 21, the opposite side of the electromagnet 27 being electrically connected with the rotor arm 26 as by a conductor 29. The arm 26 s electrically connected to the casing 15 wh1ch is associated as by a conductor 30 with the opposite side of the source of potential 23, the arrangement being such that upon energizatlon of the selected electromagnet 17 current will flow therethrough tothe commutator wheel 21 and therefrom through the electromagnet 27 to the grounded conductor 30, until such time as the shaft 20 has moved to bringthe insulating insert 25 of the wheel into contact with the brush to break the circuit.

In the operation of the device, the shaft 20 is associated in any desired manner through gearing or otherwise, with control apparatus for a radio receiving device or its equivalent. Thus, if desired, the shaft may be directly associated with the condenser plat-e control of the receiving apparatus. in such an arrangement, when it is desired to vary the setting of the condensers, the switch arm 31 of the switch is moved to contact with the desired contact 19, whereupon electrical energy will flow from the battery 23 through the switch arm 31 and the desired contact 19, to energize the desired electromagnet 17. The current will pass from the 'electromagnet 17 to the commutator wheel 21 through the brush 22 and will energize the "electromagnet 27 which is oppositely wound with respect to the windings of the electromagnet 17 whereby the energized electromagnet 17 will attract and be attracted by the energized magnet 27, which will move toward the energized magnet 17 and rotate the shaft .1). When the magnet 27 has arrived at the energized magnet 17, the insulating insert 25 of the commutator wheel 21 will move into alinement with the brush 22 whereby the passage of current through the magnets 17 and 27 is stopped and the device will remain at rest until the switch arm 31 is again moved.

In the movement of the switch arm to the desired contact 19, it will be seen that it passes over and for a short interval, energies in passage the consecutive electro-magnets 17 between the one at which the device is at rest and the one which it is desired to energize. Thus brief energization of the consecutive intermediate electromagnets 17 provides for the successive electromagnetic attraction of the electromagnet 27 to the electromagnets 17, whereby the energization of the intermediate magnets will cause the shaft 20 to be moved in' step-by-step manner to a position where the energization of the desired electromagnet 17 will move it to complete the desired fraction of a revolution.

In the present embodiment of the invention, it will be seen that only one series of stationary electromagnets has been provided,-

but it will readily be understood, however, that a plurality of series of such electromagnets may be provided without departing from the spirit of the present invention,

whereby a multitude of stopping points for the rotor will be provided. In the present instance, it will further be seen that at the breaking of the current to the electromagnets, residual magnetism will hold the rotor in its adjusted position. If desired, however, suitable balancing mechanism for the shaft 20 may be provided.

From the foregoing it will readily be seen that the present invention provides a novel and simple electrical motor which is arranged for controlling associated apparatus in an improved manner, due to its ability to be readily controlled for movements in a fraction of a revolution; It will be understood that the present invention is not conn'ned to the specific use herein illustrated or to the specific structural features herein presented, but that numerous changes and modification and the full use of equivalents may be resorted to without departing from the spirit or scope of the present invention as outline in the appended claims.

Vfhat is ciaimed is in electrical motor, comprising a casing, a plurality of stationary electromagnets carried by said casing, a rotor within said casing, an electrolnagnet carried by said rotor for electromagnetic reaction with any desired one of the stationary electromagnets, and means for energizing the rotor electromagnet upon energization of one of the stationary electromagnets, said means being operable to break the energization of both of said electromagnets when said electromagnets are in alinement, said means comprising a commutator wheel.

2. An electrical motor, comprising a casing, a plurality of stationary electromagnets tionary electromagnets, said means being operable to break the energizationof both of said electromagnets when said electromagnets are in alinement, said means comprising v a commutator wheel having an insulating insert therein.

3. An electrical motor, comprising a casing, a plurality of stationary electromagnets carried by said casing, a rotor within said casing, an electromagnet carried by said rotor for electromagnetic reaction with any desired one of the stationary electromagnets, means for energizing the rotor electromagnet upon energization of one of the stationary electromagnets, said means being operable to break the energization of both of said electromagnets when said electromagnets are in alinement, said means comprising a commutator wheel having an insulating insert therein, and brushes carried by the stationary electromagnets for contact with said wheel.

4. In an electrical motor, a casing, a plurality of circularly arranged internal stationary electromagnets carried by said easing, in single rotary electromagnet' mounted within said casing for controlling the movements of a motor shaft, remote control means for selectively energizing said stationary electromagn'ets, said means being operable to successively energize electromagnets during its movement to energize a selected stationary electromagnet, and means for energizing said rotary electromagnet upon energization of any one of said stationary electromagnets, said means being operable to break the energization of said electromagnets when the rotary electromagnet has moved to the selected energized electromagnet, said means comprising ,a commutator wheel in electrical contact with said stationary electromagnets and said rotary electromagnet.

. HOWARD z. LEFFEL. 

